Contracts core intrinsics.

These are hooks to:

  1. control whether contract checks are run
  2. allow 3rd party tools to intercept and reintepret the results of running contracts.

compiler/rustc_middle/src/mir/pretty.rs

@@ -1103,6 +1103,7 @@ impl<'tcx> Debug for Rvalue<'tcx> {
                     NullOp::AlignOf => write!(fmt, "AlignOf({t})"),
                     NullOp::OffsetOf(fields) => write!(fmt, "OffsetOf({t}, {fields:?})"),
                     NullOp::UbChecks => write!(fmt, "UbChecks()"),
+                    NullOp::ContractChecks => write!(fmt, "ContractChecks()"),
                 }
             }
             ThreadLocalRef(did) => ty::tls::with(|tcx| {

compiler/rustc_middle/src/mir/syntax.rs

@@ -1591,6 +1591,9 @@ pub enum NullOp<'tcx> {
     /// Returns whether we should perform some UB-checking at runtime.
     /// See the `ub_checks` intrinsic docs for details.
     UbChecks,
+    /// Returns whether we should perform contract-checking at runtime.
+    /// See the `contract_checks` intrinsic docs for details.
+    ContractChecks,
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]

compiler/rustc_middle/src/mir/tcx.rs

@@ -230,7 +230,8 @@ impl<'tcx> Rvalue<'tcx> {
             Rvalue::NullaryOp(NullOp::SizeOf | NullOp::AlignOf | NullOp::OffsetOf(..), _) => {
                 tcx.types.usize
             }
-            Rvalue::NullaryOp(NullOp::UbChecks, _) => tcx.types.bool,
+            Rvalue::NullaryOp(NullOp::ContractChecks, _)
+            | Rvalue::NullaryOp(NullOp::UbChecks, _) => tcx.types.bool,
             Rvalue::Aggregate(ref ak, ref ops) => match **ak {
                 AggregateKind::Array(ty) => Ty::new_array(tcx, ty, ops.len() as u64),
                 AggregateKind::Tuple => {